A supporter was seen screaming into the face of and other Liverpool stars while pointing and laughing as the whistle went at the end of extra-time during Sunday’s clash at Old Trafford.
The Red Devils in the quarter-final clash and fans could not hide their excitement at beating their arch rivals.
United have endured a difficult campaign across other competitions and the FA Cup is there last chance to secure some major silverware this term.
Following , a clip went viral on of a United fan sat right next to the away bench as he goaded Jurgen Klopp’s men.
‘F*****g come on!’ the supporter says in the video as Liverpool’s players begin to leave the bench and walk past him towards the changing rooms.
Salah, who was substituted in the 77th minute, walked past as the United fan pointed right in his face and loudly laughed.
The supporter continued to goad several other Liverpool players – including Andy Robertson – and called the Scotland international a ‘f*****g idiot’.
United fans have been loving the clip online with Reddit user Lord_Sesshoumaru77 posting: ‘Laughing in Salah’s stupid smug face has to be one of the best feelings in the world.’
Another Reddit user, Andurilightsaber, added: ‘I love this. I wanted to do exactly that hahahaha god bless this legend!!!’
Salah had scored in the match to give Liverpool a 2-1 lead but Antony’s goal in the 87th minute forced extra-time before United netted twice to secure the win.
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